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"Insiders might sell their shares for any number of reasons, but they buy them for only one:
they think the price will rise" - Peter Lynch ==>> What is insider trading>> |

| Transaction & Date | Reported Date |
Company | Symbol | Insider Relationship |
Shares Traded | Average Price | Total Amount |
Shares Ownership |
Filing |
| 2006-01-03 Other |
2006-01-05 4:51 pm | CUBIST PHARMACEUTICALS INC | CBST | EISENSTEIN BARRY I (Senior Vice President) | 948 | $11.21 | $10,629 | 14,293 (Direct) | View |
| 2005-07-01 Other |
2005-07-05 4:03 pm | CUBIST PHARMACEUTICALS INC | CBST | EISENSTEIN BARRY I (Senior Vice President) | 1,073 | $9.894 | $10,616 | 13,345 (Direct) |
View |
| 2005-01-11 Other |
2005-01-13 4:22 pm |
CUBIST PHARMACEUTICALS INC | CBST | EISENSTEIN BARRY I (Executive Vice President) | 780 | $11.83 | $9,227 | 12,272 (Direct) |
View |
| 2004-06-30 Other |
2004-07-26 1:45 pm | CUBIST PHARMACEUTICALS INC | CBST | EISENSTEIN BARRY I (Executive Vice President) | 2,186 | $9.44 | $20,636 | 11,492 (Direct) |
View |
| 2004-01-12 Other | 2004-01-13 4:39 pm |
CUBIST PHARMACEUTICALS INC | CBST | EISENSTEIN BARRY I (Executive Vice President) | 738 | $0 | $0 | 9,306 (Direct) | View |
| Transaction & Date | Reported Date |
Exercisable Expiration | Company | Symbol | Insider Relationship |
Shares Traded | Conversion Price |
Shares Ownership | Filing |
| 2006-01-31 Option Award | 2006-02-02 4:30 pm |
2006-04-30 2016-01-31 | CUBIST PHARMACEUTICALS INC | CBST | EISENSTEIN BARRY I (Senior Vice President) | 10,000 | $21.61 | 10,000 (Direct) | View |
| 2005-06-14 Option Award | 2005-06-15 4:15 pm | 2005-09-14 2015-06-14 | CUBIST PHARMACEUTICALS INC | CBST | EISENSTEIN BARRY I (Executive Vice President) | 20,000 | $10.35 | 20,000 (Direct) | View |
| 2005-02-14 Option Award | 2005-02-15 4:03 pm | 2005-05-14 2015-02-14 |
CUBIST PHARMACEUTICALS INC | CBST | EISENSTEIN BARRY I (Executive Vice President) | 20,000 | $10.87 | 20,000 (Direct) |
View |
| 2004-07-01 Option Award | 2004-07-02 12:37 pm | 2004-10-01 2014-07-01 | CUBIST PHARMACEUTICALS INC | CBST | EISENSTEIN BARRY I (Executive Vice President) | 20,000 | $10.84 | 20,000 (Direct) |
View |
| 2003-09-12 Option Award | 2003-09-16 3:14 pm | 2003-12-12 2013-09-12 |
CUBIST PHARMACEUTICALS INC | CBST | EISENSTEIN BARRY I (Executive Vice President) | 500 | $13.26 | 500 (Direct) |
View |
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